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Environmental fate & pathways

Biodegradation in water: screening tests

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Link to relevant study record(s)

Description of key information

Two studies in freshwater for the read across substance 2-(2-(2-ethoxyyethoxy)ethoxy)ethanol: BOD28=92%, BOD20=71%.
3,6,9,12-tetraoxatetradecan-1-ol: QSAR predicts readily biodegradable.

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable

Additional information

There is no biodegradation information available for the UVCB substance itself. However, ta major component of thesubstance, 2 -(2 -(2 -ethoxyethoxy)ethoxy)ethanol ,was found to be readily biodegradable in a guideline study in freshwater where the BOD28 was 92.1%. The biodegradation was also assessed at a number of concentrations using a non-adapted domestic sewage innoculum in a freshwater medium. Ready degradation was observed with a BOD20 of 71%. In a single study in saltwater using the same substance, evidence of biodegradation was seen with 22% degradation after 20 days. A reliable QSAR predicts that both this substance and the other major component, 3,6,9,12-tetraoxatetradecan-1-ol ,will be readily biodegradable. The available data leads to a reliable conclusion that 3,6,9,12-tetraoxatetradecan-1-ol will be readily biodegradable. Please see the read across justification attached to chapter 13 of the lead registrant dossier for further information on read across within the E series of glycol ethers.

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